Personalized Mechanical Engineer Gear Youth Long Sleeve T-Shirt. Mechanical Engineer text on a gear for the engineer whose mental gears are always turning out new and better ideas. A unique gift design for mechanical engineers and engineering students at back to school, birthdays, holidays or graduation. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)